DNA Fingerprinting
This approach compares specific regions of the DNA molecule, known as loci, to create a distinctive genetic profile.
DNA Fingerprinting has revolutionized fields such as forensics, paternity testing, and population genetics, enabling precise identification and establishing relationships between individuals.
The process involves extracting DNA samples, amplifying target regions using specialized techniques, and comparing the resulting patterns to establish identity or family connections.
This versatile method continues to advance, with ongoing research exploring new applications and refining the underlying technologies.
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Most cited protocols related to «DNA Fingerprinting»
Plaques were picked into 100 µl phage buffer (10 mM Tris-HCl, pH 7.5; 10 mM MgSO4; 68.5 mM NaCl; 1 mM CaCl2). One microliter was PCR amplified with flanking primers (25–35 bp) annealing upstream and downstream of the mutant allele, or by Deletion Amplification Detection Assay (DADA)-PCR using Platinum Taq High Fidelity DNA Polymerase (Invitrogen) and an upstream primer whose 3′ end anneals over the deletion junction. DADA-PCR parameters were similar to those described for MAMA-PCR[30] (link), with the combined annealing and extension step performed at or just above the melting temperature of the DADA-PCR primer. Plaques containing mixtures of deletion and wild-type DNA were picked into 100 µl buffer, and 10 µl of 10−3, 10−4 and 10−5 dilutions were plated with 300 µl M. smegmatis cells. Either individual plaques from the 10−4 and 10−5 plates or lysates from 10−3 or 10−4 plates were screened for the presence of the mutation by PCR as described above.
For generation of the respective 5' and 3' flanking sequences, primers (Table
The PCR mixture contained 1.25 U Takara Ex Taq™ (Takara Bio, Madison, Wisconsin), 1 × Ex Taq™ Buffer, 0.2 mM dNTP, 0.1 μM forward and reverse primer, 1 μl T. reesei wild-type genomic DNA (90 ng/μl) as template and nuclease free water.
Most recents protocols related to «DNA Fingerprinting»
Example 8
GuideSeq was performed to test whether end-modifications prevent double stranded DNA from directly ligating into the off-target cut sites of the guide RNA (Tsai et al., Nature Biotechnology. 33″ 187-197 (2015)). SpyCas9 protein and synthetic guide RNA targeting ARHGEF9 locus were used in HEK293 cells. The ARHGEF9 locus was chosen because it has been shown to have multiple off-target sites (Amrani et al., Genome Biology. 19: 214 (2018)). Three different types of DNA donors were used, each one being 34 bp in length and lacking homology arms. The three types were 1) a 5′ phosphorothioate modified DNA donor, 2) a 5′ phosphorothioate and phosphate modified DNA donor, and 3) a 5′ TEG and phosphate DNA donor. Over-all integration of this non-homology based direct ligation is much lower when TEG is used as the end-modification (
The wild-type HWC-168 hyphae were inoculated into 200-mL flasks containing 100 mL Potato Dextrose Broth (PDB) medium, incubated at 25°C and shaken at 120 rpm for 36 h. The mycelia were filtered through three layers of gauze and thoroughly rinsed with 0.7 mol L-1 NaCl solution 2–3 times. The hyphae were transferred to a 50-mL centrifuge tube using tweezers, and digested with a mixture of enzymes, 0.1 mg of snailase (Solarbio, Beijing, China), 0.1 mg of driselase (Biotopped, Beijing, China) and 0.1 mg of lysing enzyme (SIGMA, Shanghai, China) in 10 mL of 0.7 mol L-1 NaCl. The protoplasts were resuspended in STC buffer (1.168 M D-Sorbitol, 10 mM Tris-HCl and 4.96 mM CaCl2) and the fusion fragments mixtures were added to the PTC buffer (15 mM PEG4000, 10 mM Tris-HCl and 10 mM CaCl2). The transformants were screened on Regeneration PDA medium containing ampicillin (50 μg mL–1) and hygromycin (50 μg mL–1), and PCR was performed using specific primers of Hyg, upstream and downstream fragments to confirm the transformants.
After obtaining the mutant strains, the protoplasts were obtained from the Δ50 mutant strains. The recombinant KN vector was transformed into the protoplasts of mutant strains by PEG-mediated protoplast transformation. The neomycin resistance was used to screen the revertant strains.
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